Portable power bank



FIG. 1 is a right side view of the portable power bank, showing my design.

FIG. 2 is a front view thereof.

FIG. 3 is a left side view thereof.

FIG. 4 is a rear view thereof.

FIG. 5 is a top view thereof, the bottom being the same.

FIG. 6 is a top rear left perspective thereof; and,

FIG. 7 is a top front right perspective thereof. 

CLAIM The ornamental design for a portable power bank, as shown and described. 